precipitin

noun

pre·​cip·​i·​tin pri-ˈsi-pə-tən 

: an antibody that forms a precipitate when it unites with its antigen

Word History

Etymology

International Scientific Vocabulary, from precipitate

First Known Use

1900, in the meaning defined above

Medical Definition

precipitin

noun

pre·​cip·​i·​tin pri-ˈsip-ət-ən 

: any of various antibodies which form insoluble precipitates with specific antigens and some of which are used in serological testing